Keystones — Capstone
Five GCSE retrieval questions · 21 September 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 23cm, angle = 65°
Answer: 198cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:5. Find a:b:c.
Answer: 9:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 75, 97, 70, 90, 22, 91, 80
Answer: Mean = 75.5, Median = 80, Range = 75